Super Class rule clarification

3258 · 12-22-2009, 01:56 PM

Thanks for the feedback guys. So i have not found anything in the rule book about fuel cut methods of RPM limiting, and nobody has said anything about not doing it...... so do i assume it is OK?

danny waters sr · 12-22-2009, 04:23 PM

Quote:

Originally Posted by 3258

Thanks for the feedback guys. So i have not found anything in the rule book about fuel cut methods of RPM limiting, and nobody has said anything about not doing it...... so do i assume it is OK?

I would think if cutting fuel makes it stutter or pop and snap it would be considered a stutter and would not pass. if it cuts rpm without the stutter and is smooth sounding it may work .only thing is i would not want my fuel cut back and ruin a motor.

3258 · 12-23-2009, 08:42 AM

Thanks for the reply. I do not think i would cut fuel on a carb or mechanical injected engine, not sure that you could do that without potentially causing some problems as you said. I am not running either of those options so I think it may be possible, I just was not sure if it was legal.

voltdr · 12-24-2009, 10:49 AM

The guys that run the electronic fuel injection use a switch on the TS that tells the computer to run a different map profile while on the stop.

Freddie · 12-26-2009, 10:57 AM

Ok, I have a question on this.. I have heard many sides of electronic devices to control down track speeds....

Here is a question: IF my motor has a redline of say 7800rpm, and I use a 7500 rpm chip, lets say the car hits the high side chip at 1100' into the run...... You guys are saying this is not legal? So I am supposed to put a higher chip in and take a chance of over-reving the motor and breaking it????

63corvette · 12-26-2009, 12:20 PM

I have witnessed this one time and the driver was given the suggestion of changing the rear gears and not having the issue by NHRA tech.
The driver was warned as the limiter was a rpm limiting device before the finish line and was considered to be illegal used in that way. Limiter devices are considered safety devices by NHRA tech I would guess.
I was just parked nearby when the tech personnel visited the racer.
Just What I Witnessed

CBS · 12-26-2009, 05:43 PM

No Freddie....you can't hit the chip on the high end....intentionally.....(it does work though)....but you would be turned in in Div 3...and I bet my Div 2 buddies wouldn't be happy either....

on the Fi question.....cutting the fuel is fine as long as you close the throttle some amount....with a linkage stop or something similar....just cutting the fuel would be suspect and sooner or later someone wouldn't like it....I'm not making the rules...only giving you my opinion....nothing else...

Rock

Freddie · 12-26-2009, 06:17 PM

Quote:

Originally Posted by CBS

No Freddie....you can't hit the chip on the high end....intentionally.....(it does work though)....but you would be turned in in Div 3...and I bet my Div 2 buddies wouldn't be happy either....

Rock

Not intentional.. but I need the gear to get the car to leave and run the #'s, but for some reason the car hits the chip at around 1100'. I can prob. put a 500rpm higher chip in it and not hurt anything, but I dont like to run my FORD much over 7500 as it is...

I dont know how much of a issue it will be because I have never run it with a stop on it, and the car will definaly need to be slowed down.... I have been 9.2's so far, and thats with hitting the chip.

sc1153 · 12-29-2009, 05:50 PM

Quote:

Originally Posted by Freddie

Ok, I have a question on this.. I have heard many sides of electronic devices to control down track speeds....

Here is a question: IF my motor has a redline of say 7800rpm, and I use a 7500 rpm chip, lets say the car hits the high side chip at 1100' into the run...... You guys are saying this is not legal? So I am supposed to put a higher chip in and take a chance of over-reving the motor and breaking it????

First no race motor has an EXACT redline, just where it stops making power. Yes if you are hitting the chip it is illegal. Now there is no way for NHRA to police and / or prove that you are doing it for that far down track. I have raced a few people that do hit the high chip. (being faster car) You are making up no ground between each other, then you make a huge move late. Kinda screws you up. But YES illegal

Freddie · 12-29-2009, 08:35 PM

Chris: I realize there is no "SET" RPM limit on any motor, however when using FORD's you really dont want to push them much over 7500 for long unless you have a killer bottom end.... Unlike the Chevy, they just cant take the RRR's...

Like I also posted I dont know even if this will be an issue as I have not run the car on the stop yet, and will need to in order to run either S/G or S/ST..

12-22-2009, 01:56 PM	#1
3258 Junior Member Join Date: Dec 2009 Posts: 23 Likes: 0 Liked 0 Times in 0 Posts	Re: Super Class rule clarification Thanks for the feedback guys. So i have not found anything in the rule book about fuel cut methods of RPM limiting, and nobody has said anything about not doing it...... so do i assume it is OK?

12-23-2009, 08:42 AM	#3
3258 Junior Member Join Date: Dec 2009 Posts: 23 Likes: 0 Liked 0 Times in 0 Posts	Re: Super Class rule clarification Thanks for the reply. I do not think i would cut fuel on a carb or mechanical injected engine, not sure that you could do that without potentially causing some problems as you said. I am not running either of those options so I think it may be possible, I just was not sure if it was legal.

12-24-2009, 10:49 AM	#4
voltdr Senior Member Join Date: Jan 2008 Location: Texas Posts: 706 Likes: 77 Liked 100 Times in 51 Posts	Re: Super Class rule clarification The guys that run the electronic fuel injection use a switch on the TS that tells the computer to run a different map profile while on the stop.

12-26-2009, 10:57 AM	#5
Freddie Member Join Date: Jul 2005 Location: Tampa Fla / Anderson SC Posts: 334 Likes: 12 Liked 3 Times in 2 Posts	Re: Super Class rule clarification Ok, I have a question on this.. I have heard many sides of electronic devices to control down track speeds.... Here is a question: IF my motor has a redline of say 7800rpm, and I use a 7500 rpm chip, lets say the car hits the high side chip at 1100' into the run...... You guys are saying this is not legal? So I am supposed to put a higher chip in and take a chance of over-reving the motor and breaking it???? __________________ NHRA: Comp 2200 - S/C 2201 NMRA 2012 Outlaw 10.5 #10

12-26-2009, 12:20 PM	#6
63corvette Senior Member Join Date: Mar 2007 Location: Canyon, Tx Posts: 553 Likes: 128 Liked 361 Times in 104 Posts	Re: Super Class rule clarification I have witnessed this one time and the driver was given the suggestion of changing the rear gears and not having the issue by NHRA tech. The driver was warned as the limiter was a rpm limiting device before the finish line and was considered to be illegal used in that way. Limiter devices are considered safety devices by NHRA tech I would guess. I was just parked nearby when the tech personnel visited the racer. Just What I Witnessed

12-26-2009, 05:43 PM	#7
CBS VIP Member Join Date: Oct 2002 Location: Commerce, Mi Posts: 1,387 Likes: 1 Liked 4 Times in 2 Posts	Re: Super Class rule clarification No Freddie....you can't hit the chip on the high end....intentionally.....(it does work though)....but you would be turned in in Div 3...and I bet my Div 2 buddies wouldn't be happy either.... on the Fi question.....cutting the fuel is fine as long as you close the throttle some amount....with a linkage stop or something similar....just cutting the fuel would be suspect and sooner or later someone wouldn't like it....I'm not making the rules...only giving you my opinion....nothing else... Rock

12-29-2009, 08:35 PM	#10
Freddie Member Join Date: Jul 2005 Location: Tampa Fla / Anderson SC Posts: 334 Likes: 12 Liked 3 Times in 2 Posts	Re: Super Class rule clarification Chris: I realize there is no "SET" RPM limit on any motor, however when using FORD's you really dont want to push them much over 7500 for long unless you have a killer bottom end.... Unlike the Chevy, they just cant take the RRR's... Like I also posted I dont know even if this will be an issue as I have not run the car on the stop yet, and will need to in order to run either S/G or S/ST.. __________________ NHRA: Comp 2200 - S/C 2201 NMRA 2012 Outlaw 10.5 #10

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